A strain of inbred mouse. Inbr: F90-170 de … A strain of inbred mouse. Inbr: F90-170 depending on substrain. Agouti. Developed by Strong in 1920 from a cross of a Bagg albino female and a DBA male. Strain CBA was selected for a low mammary tumour incidence and C3H for a high incidence. Now widely distributed, and used as a general-purpose strain. Differences between substrains are probably too large to be accounted for by mutation, and some degree of genetic contamination in the past is probable. tic contamination in the past is probable.